Point of Sale: Square integration

[kaloudis]

Description

This PR adds a Point of Sale interface for Square terminals

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Configuration change
• Locales update
• Quality assurance
• Other

Checklist

• I’ve run yarn run tsc and made sure my code compiles correctly
• I’ve run yarn run lint and made sure my code didn’t contain any problematic patterns
• I’ve run yarn run prettier and made sure my code is formatted correctly
• I’ve run yarn run test and made sure all of the tests pass

Testing

If you modified or added a utility file, did you add new unit tests?

• No, I’m a fool
• Yes
• N/A

I have tested this PR on the following platforms (please specify OS version and phone model/VM):

• Android
• iOS

I have tested this PR with the following types of nodes (please specify node version and API version where appropriate):

• LND (REST)
• LND (Lightning Node Connect)
• Core Lightning (c-lightning-REST)
• Core Lightning (Spark)
• Eclair
• LndHub

Locales

• I’ve added new locale text that requires translations
• I’m aware that new translations should be made on the Zeus Transfix page and not directly to this repo

Third Party Dependencies and Packages

• Contributors will need to run yarn after this PR is merged in
• 3rd party dependencies have been modified:
  • verify that package.json and package-lock.json have been properly updated
  • verify that dependencies are installed for both iOS and Android platforms

Other:

• Changes were made that require an update to the README
• Changes were made that require an update to onboarding

[Talej]

A couple of general items

• Should the balance / keypad views still be accessible? I couldn't find any way to get back to them with POS enabled

• Was occasionally getting this error popping up. Not really sure what was causing it - maybe related to fetching fiat rates?

[Talej]

• While fiat rate was being fetched the order couldn't be viewed but it wasn't entirely obvious why... maybe touchability needs to be disabled while rates are loaded?

[kaloudis]

This should be covered by the flashing Fetching fiat rates at the top of the screen but will revisit if there's confusion out in the field

[Talej]

Just one more item I have found this morning. I created an invoice and paid the invoice by switching between apps on the same device. It looks like because of that the order didn't get marked as paid even though the invoice was paid.

This was using LND over clearnet.

Maybe there's a bug or perhaps it needs a way to manually mark an order as paid just as a fallback?

[kaloudis]

@Talej I think the listener gets killed when you navigate away from it. Will evaluate it.

Will assess this weekend whether to build the mark function into the UI or if it's OK to just have staff do that from the Square terminal. Likely needs an admin menu.